Array of autonomous short period Ocean Bottom Seismometers from the EMSO-Azores observatory, 2014-2015
|Temporal extent||2014-07 -2015-04|
|Author(s)||Crawford Wayne1, Cannat Mathilde1, Sarradin Pierre-Marie2, Romuald Daniel1|
|Affiliation(s)||1 : CNRS, IPGP, France
2 : Ifremer, Institut Carnot EDROME, France
|Keyword(s)||Mid-Atlantic Ridge, EMSO, Hydrothermal Vents, Lucky Strike, Time-Series, Environmental monitoring node, MoMAR, OBS, Ocean Bottom Seismometer, Position|
This dataset contains raw data, drift corrected data and SeisComP 3 Data Structure (SDS) from Ocean Bottom Seismometers (OBS) deployed at EMSO-Azores from July 2014 to April 2015.
The raw data are initialy in Lcheapo format. They are fixed at first to remove bugs and they are transformed to miniSEED format. The drift corrected data are obtained from fixed raw data. The drift corrected data are obtained from fixed raw data. A value is put in the Time Correction eld (eld 16) of each data header. By default, the correction is applied to the Record Start Time (eld 8) and the Time Correction Applied ag (eld 12, bit 1) is activated. Alternatively, only the Time Correction Applied eld is changed.
Seiscomp3 Data Structure (SDS) is the final product. It's the correct structure to be use in the Seiscomp 3 software.
MiniSEED is the subset of the SEED standard that is used for time series data. Very limited metadata for the time series is included in miniSEED beyond time series identification and simple state-of-health flags. In particular, geographic coordinates, response/scaling information and other information needed to interpret the data values are not included.
Time series are stored as generally independent, fixed length data records which each contain a small segment of contiguous series values. A reader of miniSEED is required to reconstruct longer, contiguous time series from the data record segments. Common record lengths are 512-byte (for real time streams) and 4096-byte (for archiving), other record lengths are used for special scenarios.
A “file” or “stream” of miniSEED is simply a concatenation of data records. Depending on the capabilities of the intended reader the data records for multiple channels of data may be multiplexed together.
More than one programming library exists to support easy reading and writing of miniSEED data without knowing the details of the format, the libmseed library is supported and used extensively by the IRIS DMC.